Electron microscopy
 
No GIF Images/Spectra
- Practical Electron Microscopy and Database -
- An Online Book -
Microanalysis | EM Book                                                                                   http://www.globalsino.com/EM/        

This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.
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If no GIF image (or spectrum) is obtained on the computer screen (or live TV), the relevant trouble shooting steps should be performed.

If no images are obtained during GIF imaging in TEM mode, the following verifications are first needed:
         i) The energy-selecting slit is retracted.
         ii) The GIF entrance aperture is not blocked by dirt or a photographic plate is not stuck in the film mechanism.

If no spectra are obtained during spectrum acquisition in STEM mode, the following verifications are first needed:
         i) Retract it if a BF (bright-field) detector is in. In order to allow the electron beam to enter the GIF, only the annular dark field detector can be used.
         ii) The Spectrum Offset is turned off or set to 0. If there is a nonzero offset, the spectra can be too weak to be visible.

For both GIF imaging and spectrum acquisition, we also need to make sure:
         i) The controllers (e.g. multi-scan camera controllers) are turned on.
         ii) A suitably intense electron beam is placed in the center of the GIF camera. In this case, we also need to verify that the electron beam is not deflected out of the center of the GIF camera when the viewing screen is raised.
         iii) Make sure the GIF gate valve is not stuck in the closed position. A control line for the gate valve should have a black label, while the other one a red label. When the black line is pressurized the gate valve should be open, when the red line is pressurized the gate valve should be closed.
         iv) The Primary Energy in the FilterControl software is set to the operating energy of the TEM.
         v) Check the communication between the FilterControl software and the Gatan Instrumentation Bin (GIB). If the communication is correct, the yellow LED on the front panel of the GIB should be on or flashing.
         vi) The Drift Tube Voltage is turned off or set to 0; otherwise, the image or spectrum can be too weak to be visible.

 

 

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